Ionic 4 how to listen to ionNavDidChange

@hkjeffchan wrote:

(1) PageA => (2) PageB (Press nav-back-button) => (3) PageA

I want to listen to the event when 3 is finished, it should be ionNavDidChange, right?

I tried to do something like this in PageA but failed. Any idea?

  constructor(private events: Events) {
    this.events.subscribe('ionNavDidChange', () => {
      console.log('ionNavDidChange');
    });
  }

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